May 2004: Accumulated Cyclone Energy (ACE) Index

Ocean Basin Tropical Cyclone Cyclogenesis Date Cyclolysis Date Saffir-Simpson Category Maximum 6-hr Sustained Wind (kt) Maximum 6-hr Wind Gust (kt) Accumulated Cyclone Energy (ACE) Index (kt2)
North Indian
 01A-04 5/5/04 5/10/04 TS 45 55 3.08 x 104
North Indian
 02B-04 5/17/04 5/19/04 TS 60 75 1.13 x 104
South Indian
 23S-04 5/5/04 5/6/04 TS 35 45 0.49 x 104
South Indian
 Juba-04 5/13/04 5/14/04 Cat 1 65 80 1.09 x 104
North Pacific
 05W-04 5/15/04 5/17/04 TS 35 45 0.25 x 104
NW Pacific
 Nida-04 5/13/04 5/21/04 Cat 5 140 170 31.43 x 104
NW Pacific
 Omais-04 5/16/04 5/22/04 Cat 1 65 80 5.75 x 104
NE Pacific
 Agatha-04 5/22/04 5/25/04 TS 45 55 2.02 x 104




The Saffir-Simpson Scale for Tropical Cyclones

Category Miles Per Hour (mph) Knots (kt) Kilometers Per Hour (km hr-1)
Tropical Storm
 39-73 34-63 63-118
Cat 1
 74-95 64-82 119-153
Cat 2
 96-110 83-95 154-177
Cat 3
 111-130 96-113 178-209
Cat 4
 131-155 114-135 210-249
Cat 5
 155 135 249